My Egyptian Pyramid Building Idea

There are several ideas on how the Egyptian pyramids were built. I have come up with my own idea which I think is different from the others. The problem I see in the other ideas is raising the huge, heavy limestone blocks higher and higher towards the top of the pyramid. In my idea you never have to raise blocks, in fact you might even be able to have the blocks go slightly downhill depending on the terrain. All that is needed is a very large limestone mountain nearby to carve the blocks from.